Signs for subleases?

We are starting to get requests to allow signs for subleased space in multi-tenanted commercial buildings. Our Zoning Ordinance allows only one sign per tenant space in a multi-tenanted building. How's everyone else regulating these circumstances?

Where I work currently, our sign regulations are focused more on the physical/visual attributes of signage. We control the number of signs on the property, the total square footage, the location, the height/width, and size of sign face. It is not based at all on how many different tenants are located on a particular property or in a building. We seem to have very few complaints.
You could consider kicking around the idea of updating your sign regulations. To me, basing the number of allowed signs on number of tenants on a property is pretty open-ended. What happens if someone has sixty tenants in a building? Are you going to allow sixty signs?

Response

Originally posted by OregonPlanner

Where I work currently, our sign regulations are focused more on the physical/visual attributes of signage. We control the number of signs on the property, the total square footage, the location, the height/width, and size of sign face. It is not based at all on how many different tenants are located on a particular property or in a building. We seem to have very few complaints.
You could consider kicking around the idea of updating your sign regulations. To me, basing the number of allowed signs on number of tenants on a property is pretty open-ended. What happens if someone has sixty tenants in a building? Are you going to allow sixty signs?

We have other limitations, such as no more than 10% of the front facade and 40% of the area upon which the sign is applied, etc. But yes, it is scary, 60 signs could be placed provided they all had the required exterior store frontage.

The trend here is for the leaseholder of one tenant space to sublease to a sublessee. These sublessee's are starting to want exterior signage as well. While our ordinance allows only one sign per tenant space, we are in a quandry. In some situations a second sign may be appropriate, other times it may not be. Do you have any experience with this situation?